19880455

素因数分解:

$5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{73}}^1\times {\mathrm{251}}^1$

素因数の和:367

約数の個数: 32

約数和(自身を含む): 28643328

約数和(自身を除く): 8762873

約数列:

[1, 5, 7, 31, 35, 73, 155, 217, 251, 365, 511, 1085, 1255, 1757, 2263, 2555, 7781, 8785, 11315, 15841, 18323, 38905, 54467, 79205, 91615, 128261, 272335, 568013, 641305, 2840065, 3976091, 19880455]

約数ペア:

[(1, 19880455), (5, 3976091), (7, 2840065), (31, 641305), (35, 568013), (73, 272335), (155, 128261), (217, 91615), (251, 79205), (365, 54467), (511, 38905), (1085, 18323), (1255, 15841), (1757, 11315), (2263, 8785), (2555, 7781)]